def normNum(num):
  arcpy.Statistics_analysis(r'C:Geodatabase.gdbOriginal_Features',r'C:Geodatabase.gdbTemp_Table', [["Field1","MIN"],["Field1","MAX"]])
  with arcpy.da.SearchCursor(r'C:Geodatabase.gdbTemp_Table', ("MAX_Field1" , "MIN_Field1")) as cursor:
    for row in cursor:
      maxNum = row[0]
      minNum = row[1]
  del cursor
  del row
  arcpy.Delete_management(r'C:Geodatabase.gdbTemp_Table')
  return ((num - minNum) / ( maxNum - minNum))

normNum(!Field1!)

def NormalizedNumbersToField(table, field, scratchGDB):
    arcpy.AddField_management(table, "NORMALIZED", "DOUBLE")
    scratchTable = os.path.join(scratchGDB, "Temp_Feat")
    arcpy.Statistics_analysis(table,scratchTable, [[str(field),"MIN"],[str(field),"MAX"]])
    with arcpy.da.SearchCursor(scratchTable, ("MAX_" + str(field) , "MIN_" + str(field))) as cursor:
        for row in cursor:
            maxNum = row[0]
            minNum = row[1]
    del cursor, row
    arcpy.Delete_management(scratchTable)
    with arcpy.da.UpdateCursor(table, ( field , "NORMALIZED" )) as cursor:
        for row in cursor:
            number = row[0]
            row[1] = (( number - minNum ) / ( maxNum - minNum ))
            cursor.updateRow(row)
    del cursor, row